CN104407914A - Instrument usability analysis method for nuclear power plant - Google Patents
Instrument usability analysis method for nuclear power plant Download PDFInfo
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- CN104407914A CN104407914A CN201410656142.3A CN201410656142A CN104407914A CN 104407914 A CN104407914 A CN 104407914A CN 201410656142 A CN201410656142 A CN 201410656142A CN 104407914 A CN104407914 A CN 104407914A
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Abstract
The invention discloses an instrument usability analysis method for a nuclear power plant. The method is used when the instrument usability cannot be judged through an identification curve enveloping method under a severe accident condition. The method comprises the following steps: establishing a corresponding equivalent circuit according to instrument characteristics; determining the influences of different environmental factors on the equivalent circuit; establishing a performance degradation circuit characteristic; introducing a noise circuit into the equivalent circuit to obtain an analog circuit; running a simulation program based on the analog circuit, and comparing output waveforms to realize efficient and accurate analysis of the instrument usability of the nuclear power plant. The method has the advantages of high operability, low analysis cost, wide analysis range, low hidden danger, and enhancement on the technical effect of the safety of the nuclear power plant.
Description
Technical field
The present invention relates to nuclear power research field, particularly relate to a kind of nuclear power plant instrument availability analytical approach.
Background technology
B7000 has been increased newly in current nuclear power standard RCC-E 2005 " pressurized-water reactor nuclear power plant nuclear island electronic device design and construction rule ", give the evaluation program of the instrument under severe accident conditions, but be only applicable to newly build a power station, mandatory requirement is not done for built nuclear power plant.
After Fukushima nuclear accident, State Bureau of Nuclear Safety to require the whole nation in fortune, carries out safety inspection building nuclear power station.Therefore usability analyses must be carried out to instrument required under each power plant major accident operating mode.For the two Dai Jia nuclear power plants that the current recoverable amount of China is larger, can instrument all not through major accident qualification, cannot directly judge keep availability under this condition.If to instrument supplementary type test, be not only difficult to technically at present realize, and with high costs, a lot of difficulty may be faced in practical operation.
To in the pertinent literature retrieval of instrument availability under domestic major accident on CNKI, only retrieve " comparative analysis that the qualification of CPR1000 major accident instrument requires and application ", be published in " Nuclear Science And Engineering " 12 monthly magazines in 2012.This article centering, U.S., method equipment qualification regulation, standard are analyzed, and the suggestion of instrument authentication method and program under giving major accident.The evaluation method of instrument availability under concrete major accident is not provided in literary composition.Equally for built nuclear power plant, carrying out instrument, severe accident conditions qualification is unrealistic, does not possess good operability.
The instrument availability evaluation method used in EPRITR-103412 " Assessment of Existing Plant Instrumentation for Severe Accident Management " generally adopts method identical with current domestic design institute, be qualification envelope of curve method, environmental baseline curve when identifying by instrument and the environmental baseline curve of major accident carry out envelope contrast, in conjunction with the analysis of instrument environment sensitive factor, evaluate instrument performance under severe accident conditions and whether be affected.The method has good confidence level, but too conservative to a certain extent.Particularly when identify curve cannot envelope ambient trace, can not simply judge that instrument is unavailable, also show that it is available without other evidences.In practical engineering experience, this type of situation also often occurs.
In sum, present inventor, in the process realizing invention technical scheme in the embodiment of the present application, finds that above-mentioned technology at least exists following technical matters:
In the prior art, because existing nuclear power plant instrument availability analytical approach adopts qualification envelope of curve method to analyze, but when when identify curve cannot envelope ambient trace, now can not simply judge that instrument is unavailable, also show that instrument can be used without other evidences, and adopt other instrument availability analytical approach mainly to adopt manually to operate, cost is higher, easily make mistakes, and need to carry out a large amount of repeated experiment, instrument for built nuclear power plant is carried out usability analyses and is not possessed good operability, so, existing nuclear power plant instrument availability analytical approach there is analysis efficiency and accuracy rate is lower, cost is higher, operability is lower, analyst coverage is narrower easily exists hidden danger, and easily make mistakes and cause endangering the technical matters of npp safety.
Summary of the invention
The invention provides a kind of nuclear power plant instrument availability analytical approach, solve existing nuclear power plant instrument availability analytical approach and there is analysis efficiency and accuracy rate is lower, cost is higher, operability is lower, analyst coverage is narrower easily exists hidden danger, and easily make mistakes and cause endangering the technical matters of npp safety, achieve the analysis completing the instrument availability to nuclear power plant of efficiently and accurately, operability is higher, and analysis cost is lower, the wide hidden danger of analyst coverage is lower, and then improves the technique effect of npp safety.
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of nuclear power plant instrument availability analytical approach, and under being applied to major accident operating mode, when identifying that envelope of curve method cannot judge instrument availability, described method comprises:
Step 1: set up corresponding equivalent electrical circuit according to instrument and signal transmission characteristics;
Step 2: determine that different major accident environmental factor is on the impact of described equivalent electrical circuit;
Step 3: environmental baseline residing for comprehensive equivalent electrical circuit feature and instrument, sets up the circuit feature of performance degradation;
Step 4: introduce Noise Circuits in described equivalent electrical circuit, obtains the circuit model by noise;
Step 5: based on step 1-step 4, set up appliance circuit respectively not by noise and the circuit model being subject to noise, described circuit model is placed in simulated program run, described simulated program provides corresponding output waveform by based on model and default simulated environment.
Further, also comprise after described step obtains output waveform: the output waveform of gained is analyzed with appliance circuit output waveform under home, according to comparing result, tested instrument is divided into: available, available, unavailable three classes of demoting.
Further, described comparing result is specially: under circuit model output waveform under major accident is with home, circuit model output waveform is consistent, when namely output meets accuracy requirement in Instrumentation Requirement book, judges that instrument can be used; Under circuit model output waveform under major accident is with home, circuit model output waveform is inconsistent, but still can demonstrate stability number in pulpit, and when can reflect parameter variation tendency, judges that instrument degradation is available; When under major accident, circuit model output waveform exceedes indication range, or when parameter cannot stablize reading, judge that instrument is unavailable.
Further, describedly set up corresponding equivalent electrical circuit according to meter performance and specifically comprise:
First, according to the type of instrument, obtain measuring principle and the circuit structure of corresponding instrument;
Then, according to the sensitive components in instrument and circuit structure, determine the components and parts in described equivalent electrical circuit and layout thereof;
Then, according to the circuit signal output characteristic of instrument, determine the signal output characteristic of described equivalent electrical circuit;
Then, based on described measuring principle and described circuit structure, and described components and parts, and described logarithmic output signal certificate, set up described equivalent electrical circuit.
Further, described environmental factor includes but not limited to: one or more in temperature, pressure, humidity, irradiation, combustible gas deflagrating, gasoloid.
Further, the described circuit feature setting up performance degradation is specially: the distribution parameter arranging described equivalent electrical circuit according to instrument component Parameter Variation under various circumstances and the affecting laws of environment to instrument entirety, simulation actual environment, on the impact of described equivalent electrical circuit, sets up the circuit feature of performance degradation.
Further, describedly in described equivalent electrical circuit, introduce Noise Circuits, obtain mimic channel and be specially: load in described equivalent electrical circuit according to Noise Circuits, be usually incorporated to from the power supply of instrument and signal acquisition part, obtain described mimic channel.
Further, the noise pattern of described Noise Circuits includes but not limited to: one or more in the peak voltage noise of difference mode/common mode undesired signal noise, earth system, the peak voltage noise of inside circuit.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
First corresponding equivalent electrical circuit is set up according to instrument and signal transmission characteristics owing to have employed, then determine that different major accident environmental factor is on the impact of described equivalent electrical circuit, then environmental baseline residing for comprehensive equivalent electrical circuit feature and instrument, sets up the circuit feature of performance degradation, then in described equivalent electrical circuit, introduce Noise Circuits, obtain the circuit model by noise, then appliance circuit is set up respectively not by noise and the circuit model being subject to noise, described circuit model is placed in simulated program run, described simulated program will provide the technological means of corresponding output waveform based on model and default simulated environment, namely when identifying that envelope of curve method cannot judge instrument availability, adopt simulation technology, environmental factor under simulation major accident is analyzed instrument availability, so, efficiently solve existing nuclear power plant instrument availability analytical approach and there is analysis efficiency and accuracy rate is lower, cost is higher, operability is lower, analyst coverage is narrower easily exists hidden danger, and easily make mistakes and cause endangering the technical matters of npp safety, and then achieve the analysis completing the instrument availability to nuclear power plant of efficiently and accurately, operability is higher, and analysis cost is lower, the wide hidden danger of analyst coverage is lower, and then improve the technique effect of npp safety.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the embodiment of the present application one center power plant instrument usability analyses method.
Embodiment
The invention provides a kind of nuclear power plant instrument availability analytical approach, solve existing nuclear power plant instrument availability analytical approach and there is analysis efficiency and accuracy rate is lower, cost is higher, operability is lower, analyst coverage is narrower easily exists hidden danger, and easily make mistakes and cause endangering the technical matters of npp safety, achieve the analysis completing the instrument availability to nuclear power plant of efficiently and accurately, operability is higher, and analysis cost is lower, the wide hidden danger of analyst coverage is lower, and then improves the technique effect of npp safety.
Technical scheme during the application implements is for solving the problems of the technologies described above.General thought is as follows:
Have employed and first set up corresponding equivalent electrical circuit according to instrument and signal transmission characteristics, then determine that different major accident environmental factor is on the impact of described equivalent electrical circuit, then environmental baseline residing for comprehensive equivalent electrical circuit feature and instrument, sets up the circuit feature of performance degradation, then in described equivalent electrical circuit, introduce Noise Circuits, obtain the circuit model by noise, then appliance circuit is set up respectively not by noise and the circuit model being subject to noise, described circuit model is placed in simulated program run, described simulated program will provide the technological means of corresponding output waveform based on model and default simulated environment, namely when identifying that envelope of curve method cannot judge instrument availability, adopt simulation technology, environmental factor under simulation major accident is analyzed instrument availability, so, efficiently solve existing nuclear power plant instrument availability analytical approach and there is analysis efficiency and accuracy rate is lower, cost is higher, operability is lower, analyst coverage is narrower easily exists hidden danger, and easily make mistakes and cause endangering the technical matters of npp safety, and then achieve the analysis completing the instrument availability to nuclear power plant of efficiently and accurately, operability is higher, and analysis cost is lower, the wide hidden danger of analyst coverage is lower, and then improve the technique effect of npp safety.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
Embodiment one:
In embodiment one, provide a kind of nuclear power plant instrument availability analytical approach, under being applied to major accident operating mode, when identifying that envelope of curve method cannot judge instrument availability, please refer to Fig. 1, described method comprises:
Step 1, sets up corresponding equivalent electrical circuit according to instrument and signal transmission characteristics.
Wherein, in the embodiment of the present application, describedly set up corresponding equivalent electrical circuit according to instrument and signal transmission characteristics and specifically comprise:
First, according to the type of instrument, obtain measuring principle and the circuit structure of corresponding instrument;
Then, according to the sensitive components in instrument and circuit structure, determine the components and parts in described equivalent electrical circuit and layout thereof;
Then, according to the circuit signal output characteristic of instrument, determine the signal output characteristic of described equivalent electrical circuit;
Then, based on described measuring principle and described circuit structure, and described components and parts, and described logarithmic output signal certificate, set up described equivalent electrical circuit.
Wherein, in the embodiment of the present application, technical scheme has worked out the establishment principle of simple equivalent circuit:
1. the measuring principle of dissimilar instrument and circuit structure different, by analyzing the sensitive components the most easily by major accident environmental influence in corresponding instrument circuit, determine appearance components and parts necessary in equivalent electrical circuit, and components and parts change must with primary circuit equivalence on the impact of equivalent electrical circuit;
2. the signal output type of equivalent electrical circuit and scope need identical with instrument primary circuit;
3. what need consideration major accident environment to cause instrument protection, shielding and signal transmission line may affect, and above-mentioned impact can be embodied in equivalent electrical circuit.
In this step of equivalent electrical circuit feature setting up performance degradation, the impact that major accident environmental baseline causes instrument protection, shielding, connector, cable etc. will be considered, and set up corresponding characteristic model.Such as, modeling being carried out to this characteristic of signal-transmitting cable decreasing insulating, embodying by changing in circuit model insulating resistance value between cable.
After step 1, the method for the embodiment of the present application just enters step 2, that is: determine that different major accident environmental factor is on the impact of described equivalent electrical circuit.
Wherein, in the embodiment of the present application, described environmental factor includes but not limited to: one or more in temperature, pressure, humidity, irradiation, combustible gas deflagrating, gasoloid.
Wherein, in the embodiment of the present application, the environmental factor considered is needed to comprise temperature, pressure, humidity (comprising chemical spray), irradiation, combustible gas deflagrating, gasoloid etc. in major accident operating mode.Because major accident sequence is different with instrument installation site, need the above-mentioned environmental factor component design parameter difference considered.The calculating of major accident environmental parameter can rely on the ripe calculation procedure of safety analysis specialty to complete, after calculating environmental parameter, according to provide in step one the feature of equivalent electrical circuit, determine its possible circuit variation pattern and simulating scheme.Circuit variation pattern and simulating scheme are arranged according to concrete major accident environmental parameter.According to above, environmental factor includes but not limited to: one or more in temperature, pressure, humidity, irradiation, combustible gas deflagrating, gasoloid.When the parameter of these environmental baselines is higher than instrument mirror timing condition, will pay attention to it, to determine simulating scheme.
After step 2, the method for the embodiment of the present application just enters step 3, that is: environmental baseline residing for comprehensive equivalent electrical circuit feature and instrument, sets up the circuit feature of performance degradation.
Wherein, in the embodiment of the present application, the described circuit feature setting up performance degradation is specially: the distribution parameter arranging described equivalent electrical circuit according to instrument component Parameter Variation under various circumstances and the affecting laws of environment to instrument entirety, simulation actual environment, on the impact of described equivalent electrical circuit, sets up the circuit feature of performance degradation.
Wherein, in the embodiment of the present application, the factors such as humidity, chemical spray, flammable gas explosion may cause instrument (comprising cable) to protect degradation, and protecting sheathing is impaired, degradation under insulation and shielding properties.Can by according to the parameter such as resistance, electric capacity over the ground or between cable in instrument component Parameter Variation amendment equivalent electrical circuit under various circumstances, simulation actual environment, on its impact, sets up the circuit feature of performance degradation.
After step 3, the method for the embodiment of the present application just enters step 4, that is: in described equivalent electrical circuit, introduce Noise Circuits, obtains the circuit model by noise.
Wherein, in the embodiment of the present application, describedly in described equivalent electrical circuit, introduce Noise Circuits, obtain mimic channel and be specially: the power supply and the signal acquisition part that are incorporated to instrument according to Noise Circuits, described Noise Circuits is accessed described equivalent electrical circuit cable, obtains described mimic channel.
Wherein, in the embodiment of the present application, under major accident environmental baseline, electromagnetic environment worsens, and instrument antijamming capability weakens, and each noise like can be coupled with appliance circuit by different approaches.Usually seal in interference voltage with forms such as inductive coupling, capacitive coupling, electromagnetic radiation or directly import because this locality is different with the earth potential in a distant place.Noise is introduced by supply lines, signal input-output line and shell usually.Therefore Noise Circuits can be incorporated to power supply and the signal acquisition part of instrument, and access equivalent electrical circuit cable, sets up complete metering circuit.
Wherein, in the embodiment of the present application, the noise pattern of described Noise Circuits includes but not limited to: difference mode/common mode undesired signal noise, the peak voltage noise of earth system, one or more in the peak voltage noise of inside circuit.
According to the feature of nuclear power plant's meter body and mounting means, more believable noise pattern comprises following three kinds:
1. difference mode/common mode undesired signal noise: such undesired signal is introduced by power equipment, wherein that more common is peak value 10V-50V, the Hz noise of frequency 50Hz.Under normal operation, this noise can not have an impact to circuit, but due to instrument protection and shielding properties degradation under accident conditions, then must consider.Most typical two cable earth impedance for connecting instrument are different, the 10V noise signal of introducing.
2. the peak voltage noise of earth system: this noise is caused by the change of inductive load.When relay trembles or disturb by other, the opening and closing repeatedly of 48V DC relay can cause peak voltage.This noise typical model is the input of the 500V peak voltage of width 1ms, the 400V voltage noise of Output rusults to be width be 7ms.
3. the peak voltage noise of inside circuit: the mutual inductance interference that this noise is brought by magnetic Field Coupling causes.Its source is inductive coupling electric current, is caused by some element or equipment failure.After instrument shielding and cable insulation are due to major accident damage, its shielding, for earth wire failure, introduces this noise by masked segment.
After step 4, the method of the embodiment of the present application just enters step 5, that is: based on step 1-step 4, set up appliance circuit respectively not by noise and the circuit model being subject to noise, described circuit model is placed in simulated program run, described simulated program provides corresponding output waveform by based on model and default simulated environment.
Wherein, in the embodiment of the present application, cross the circuit model that above-mentioned four steps have set up complete major accident operating mode, run after set temperature environment, the output waveform under respective environment can be obtained.Respectively major accident operating mode circuit model output waveform and normal, expected output waveform are contrasted, and according to certain criterion, the output waveform under major accident operating mode is judged, be divided into available, available, unavailable three classes of demoting.With this can analysis environments on the impact of instrument availability, and the probable failure models of instrument can estimated to a certain extent.
Wherein, in the embodiment of the present application, also comprise after described step contrast output waveform: described output waveform and expection output waveform are contrasted, according to comparing result, tested instrument is divided into: available, available, unavailable three classes of demoting.
Wherein, in the embodiment of the present application, described comparing result is specially: under circuit model output waveform under major accident is with home, circuit model output waveform is consistent, when namely output meets accuracy requirement in Instrumentation Requirement book, judges that instrument can be used; Under circuit model output waveform under major accident is with home, circuit model output waveform is inconsistent, but still can demonstrate stability number in pulpit, and when can reflect parameter variation tendency, judges that instrument degradation is available; When under major accident, circuit model output waveform exceedes indication range, or when parameter cannot stablize reading, judge that instrument is unavailable.
To qualification envelope of curve method, method in the embodiment of the present application, by adopting simulation technology, cannot judge that the instrument of availability carries out assay further.Based on this weak link of nuclear power plant's reply major accident is improved, improve security and the economy of nuclear power plant's operation.
After employing simulation technology, reasonable believable analysis can be carried out by the method in the embodiment of the present application further to instrument availability under major accident, compensate for the shortcoming that envelope of curve method is too guarded.Such nuclear power plant can rectify and improve the instrument of weakness, substantially increases the ability of power plant's reply major accident, improves the security of nuclear power plant.In addition, the method applicability is strong, can be used for newly-built and built nuclear power plant.Avoid test instrument being carried out to repetition simultaneously, saved a large amount of funds, time and manpower, there is significant economic benefit.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
First corresponding equivalent electrical circuit is set up according to instrument and signal transmission characteristics owing to have employed, then determine that different major accident environmental factor is on the impact of described equivalent electrical circuit, then environmental baseline residing for comprehensive equivalent electrical circuit feature and instrument, sets up the circuit feature of performance degradation, then in described equivalent electrical circuit, introduce Noise Circuits, obtain the circuit model by noise, then appliance circuit is set up respectively not by noise and the circuit model being subject to noise, described circuit model is placed in simulated program run, described simulated program will provide the technological means of corresponding output waveform based on model and default simulated environment, namely when identifying that envelope of curve method cannot judge instrument availability, adopt simulation technology, environmental factor under simulation major accident is analyzed instrument availability, so, efficiently solve existing nuclear power plant instrument availability analytical approach and there is analysis efficiency and accuracy rate is lower, cost is higher, operability is lower, analyst coverage is narrower easily exists hidden danger, and easily make mistakes and cause endangering the technical matters of npp safety, and then achieve the analysis completing the instrument availability to nuclear power plant of efficiently and accurately, operability is higher, and analysis cost is lower, the wide hidden danger of analyst coverage is lower, and then improve the technique effect of npp safety.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. nuclear power plant's instrument availability analytical approach, under being applied to major accident operating mode, when identifying that envelope of curve method cannot judge instrument availability, it is characterized in that, described method comprises:
Step 1: set up corresponding equivalent electrical circuit according to instrument and signal transmission characteristics;
Step 2: determine that different major accident environmental factor is on the impact of described equivalent electrical circuit;
Step 3: environmental baseline residing for comprehensive equivalent electrical circuit feature and instrument, sets up the circuit feature of performance degradation;
Step 4: introduce Noise Circuits in described equivalent electrical circuit, obtains the circuit model by noise;
Step 5: based on step 1-step 4, set up appliance circuit respectively not by noise and the circuit model being subject to noise, described circuit model is placed in simulated program run, described simulated program provides corresponding output waveform by based on model and default simulated environment.
2. method according to claim 1; it is characterized in that; also comprise after described step obtains output waveform: the output waveform of gained is analyzed with appliance circuit output waveform under home, according to comparing result, tested instrument is divided into: available, available, unavailable three classes of demoting.
3. method according to claim 2, it is characterized in that, described comparing result is specially: under circuit model output waveform under major accident is with home, circuit model output waveform is consistent, when namely output meets accuracy requirement in Instrumentation Requirement book, judges that instrument can be used; Under circuit model output waveform under major accident is with home, circuit model output waveform is inconsistent, but still can demonstrate stability number in pulpit, and when can reflect parameter variation tendency, judges that instrument degradation is available; When under major accident, circuit model output waveform exceedes indication range, or when parameter cannot stablize reading, judge that instrument is unavailable.
4. method according to claim 1, is characterized in that, describedly sets up corresponding equivalent electrical circuit according to meter performance and specifically comprises:
According to the type of instrument, obtain measuring principle and the circuit structure of corresponding instrument;
According to the sensitive components in instrument and circuit structure, determine the components and parts in described equivalent electrical circuit and layout thereof;
According to the circuit signal output characteristic of instrument, determine the signal output characteristic of described equivalent electrical circuit;
Based on described measuring principle and described circuit structure, and described components and parts, and described logarithmic output signal certificate, set up described equivalent electrical circuit.
5. method according to claim 1, is characterized in that, described environmental factor includes but not limited to: one or more in temperature, pressure, humidity, irradiation, combustible gas deflagrating, gasoloid.
6. method according to claim 1, it is characterized in that, the described circuit feature setting up performance degradation is specially: the distribution parameter arranging described equivalent electrical circuit according to instrument component Parameter Variation under various circumstances and the affecting laws of environment to instrument entirety, simulation actual environment, on the impact of described equivalent electrical circuit, sets up the circuit feature of performance degradation.
7. method according to claim 1, it is characterized in that, describedly in described equivalent electrical circuit, introduce Noise Circuits, obtain mimic channel and be specially: load in described equivalent electrical circuit according to Noise Circuits, usually be incorporated to from the power supply of instrument and signal acquisition part, obtain described mimic channel.
8. method according to claim 7, it is characterized in that, the noise pattern of described Noise Circuits includes but not limited to: one or more in the peak voltage noise of difference mode/common mode undesired signal noise, earth system, the peak voltage noise of inside circuit.
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| CN103852094A (en) * | 2012-12-07 | 2014-06-11 | 中国核动力研究设计院 | Method for judging influences of transient high temperature on meter |
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Application publication date: 20150311 |